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Matching Placebo to Certolizumab Pegol (CZP) injections from Week 0 to Week 24. Placebo subjects who did not achieve certain predefined response criteria at both Weeks 14 and 16 left the Placebo group and were re-randomized to either CZP 200 mg Q2W or CZP 400 mg Q4W arm on Week 16.

After 24 weeks, all subjects were re-randomized to active treatment with CZP 200 mg every two weeks (Q2W) or CZP 400 mg every four weeks (Q4W).

Other: Placebo

Matching Placebo to CZP injection.

Placebo to CZP 200 mg escape on Week 16

Matching Placebo to CZP injections from Week 0 to Week 16. Subjects who did not achieve certain predefined response criteria at both Weeks 14 and 16 left the Placebo group on Week 16 and were treated with three loading doses of CZP 400 mg sc on Weeks 16, 18 and 20, followed by 200 mg CZP sc every 2 weeks (Q2W) from Week 22 onwards. Additionally, Placebo injections were administered as appropriate in order to maintain the study blind.

Matching Placebo to CZP injections from Week 0 to Week 16. Subjects who did not achieve certain predefined response criteria at both Weeks 14 and 16 left the Placebo group on Week 16 and were treated with three loading doses of CZP 400 mg sc on Weeks 16, 18 and 20, followed by 400 mg CZP sc every 4 weeks (Q4W) from Week 24 onwards. Additionally, Placebo injections were administered as appropriate in order to maintain the study blind.

Matching Placebo to CZP injections from Week 0 to Week 24. Three loading doses of CZP 400 mg sc were given on Weeks 24, 26 and 28, followed by 200 mg CZP sc every 2 weeks (Q2W) from Week 30 onwards. Additionally, Placebo injections were administered as appropriate in order to maintain the study blind.

Matching Placebo to CZP injections from Week 0 to Week 24. Three loading doses of CZP 400 mg sc were given on Weeks 24, 26 and 28, followed by 400 mg CZP sc every 4 weeks (Q4W) from Week 32 onwards. Additionally, Placebo injections were administered as appropriate in order to maintain the study blind.

Change From Baseline in Modified Total Sharp Score (mTSS) in Modification for Psoriatic Arthritis at Week 24 [ Time Frame: From Baseline to Week 24 ]

Van der Heijde modified Total Sharp Score (mTSS) is a methodology to assess the degree of joint damage by quantifying the extent of bone erosions and joint space narrowing for 64 and 52 joints, respectively, with higher scores representing greater damage. mTSS (bone erosions) ranges from 0 (best possible outcome) to 320 (worst possible outcome); mTSS (joint space narrowing) ranges from 0 (best possible outcome) to 208 (worst possible outcome); and total score ranges from 0 (best possible outcome) to 528 (worst possible outcome). For the pre-defined analysis of this outcome measure, 0 was used for Baseline and the maximum observed mTSS value was used for Week 24 for those subjects which had less than 2 radiographs. The re-analysis is restricted to those subjects in the Randomized Set who have at least 2 x-ray values at scheduled visits, which are at least 8 weeks apart.

Secondary Outcome Measures
:

American College of Rheumatology 20 (ACR20) Response at Week 24 [ Time Frame: Week 24 ]

The HAQ-DI is a measure of function in Arthritis. There are 20 items in eight categories that represent a comprehensive set of functional activities on a scale from 0 (without difficulty) to 3 (unable to perform without assistance). The category scores are averaged into an overall HAQ-DI from 0 to 3. Scores of 0 to 1 generally represent mild to moderate difficulty, 1 to 2 represent moderate to severe disability, and 2 to 3 indicate severe to very severe disability. A negative value in HAQ-DI change from Baseline indicates an improvement from Baseline. The higher the negative value, the higher the improvement.

The PASI75 response assessments are based on at least 75 % improvement in the PASI score from Baseline. The PASI score is a measure of the average redness, thickness, and scaliness of the psoriatic skin lesions (each graded on a 0 to 4 scale), weighted by the area of involvement.

Change From Baseline in Modified Total Sharp Score (mTSS) at Week 48 [ Time Frame: From Baseline to Week 48 ]

For the analysis of this outcome measure, the change from Baseline to Week 48 was imputed using the median change from Baseline among all subjects for those subjects, which had less than 2 radiographs. The post-hoc analysis presented here is based on the subgroup of subjects which had a Baseline mTSS value greater than 6.

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Ages Eligible for Study:

18 Years and older (Adult, Senior)

Sexes Eligible for Study:

All

Accepts Healthy Volunteers:

No

Criteria

Inclusion Criteria:

Diagnosis of adult-onset Psoriatic Arthritis (PsA) of at least 6 months' duration as defined by the Classification Criteria for Psoriatic Arthritis (CASPAR criteria)

Active Psoriatic Skin Lesions or a documented history of Psoriasis

Active Arthritis with ≥ 3 tender joints at Screening and Baseline, ≥ 3 swollen joints at Screening and Baseline and fulfilling at least 1 of the following 2 criteria during the Screening Period:

Erythrocyte Sedimentation Rate (ESR) (Westergren) ≥ 28 mm/hour

C-reactive protein (CRP) > Upper Limit Normal (ULN)

Failure to 1 or more treatment with Disease-Modifying Anti-Rheumatic Drugs (DMARDs)

Exclusion Criteria:

Diagnosis of any other inflammatory Arthritis or known diagnosis of Fibromyalgia

Exposure to more than 1 Tumor Necrosis Factor α (TNFα) antagonist or to more than 2 previous biological response modifiers for PsA or Psoriasis